Worries that the Federal Reserve and Chairman Alan Greenspan may adopt a tightening bias at today’s meeting sent blue chip slumping.

Fearless tech investors, however, showed no such worries and powered the Nasdaq composite index to its 55th record high of the year.

The Nasdaq rocketed 30.81 yesterday to 3,783.87, giving it a year-to-date gain of 72.57 percent.

The Dow, by contrast, slumped 113.16 to close at 11,114.27, paring its year-to-date return to 21.38 percent. The S&P 500 gave back 2.96 to close at 1,418.09 with a year-to-gain of 15.36 percent.

While Nasdaq got a big boost from its concentration in high-flying technology stocks, the other major averages were dragged down by banks, which mostly moved lower before today’s meeting of the Fed’s interest-rate policy committee.

J.P. Morgan, for example, was one of the biggest losers in the Dow, dropping $2.56 to $125.56 — even while most economists remain convinced that the Fed will not increase interest rates.

“Although the experts are nearly unanimous that the Federal Reserve will not take action with regard to rates at (today’s) meeting, the weakness in banking stocks could be a sign that investors are pricing in expectations of a shift to a tightening bias,” he added.